Ubuntu 20.04 daily build experience on dell precision T5810 tower;

20200316:  download latest daily build ubuntu 20.04;
google: ubuntu 20.04 daily build download
URL: http://cdimage.ubuntu.com/daily-live/pending/
date of files is 2020-03-16 08:00; click "64-bit PC (AMD64) desktop image);
using google chrome it starts downloading immediately to my downloads folder: /home/<me>/Downloads/focal-desktop-amd64.iso (2.6gb)
took about 5-7 minutes to download;
long experience has shown me that rufus works "EVERY" time; never had a failure; so I copy this ISO to a windows host and open utility RUFUS to copy to usb flash drive;
using host computer dell precision t5810 tower; turn off secure boot in bios; reboot and F12 to select to boot from this usb drive;
prompt to install ubuntu; boots up into ubuntu gnome desktop;
normal install wizard; I select "Normal Installation" "Download updates while installing Ubuntu" & "Install third-party software for graphics and Wi-Fi hardware and additional media formats";
Just for kicks, select the "EXPERIMENTAL: Erase disk and use ZFS"; not that I really know much about ZFS or how to use its features;

after install completes, reboot;
get normal login prompt; enter pw; ok; but now I get a black screen; rebooted to fix but same thing; after login, get black screen; so pushed the power button and it came up to the normal locked desktop screen; enter in pw again for this user efudd and it now shows the desktop; not sure what this is.

Now to start installing/configuring per my needs/desires;
1) install all updates;
2) configure screen saver to wait 60 minutes before locking;
3)

So noticed the icon in the left-side icon bar and removed the usb flash drive; the icon did not go away and won't eject and go away; so rebooted; now back to square one; after pw and enter, screen goes to black; haven't found a way to get around this;

press ctrl + alt + F5 to get terminal; login ok;
# lshw | less
and scroll down to see the Nvidia card model info;
GM107GL Quadro K620

or use this better form of the lshw cmd;
# lshw -C display
this gave me the model number;

tried installing a prior version of nvidia driver (430; vs the 440 installed)
this did not work;

-=-=-=-=-=-=-=- then used cmds from this site to remove nvidia drivers;
How to uninstall the NVIDIA drivers on Ubuntu 20.04 Focal Fossa Linux
Lubos Rendek
https://linuxconfig.org/how-to-uninstall-the-nvidia-drivers-on-ubuntu-20-04-focal-fossa-linux
The following commands will remove the proprietary Nvidia driver:
$ sudo dpkg -P $(dpkg -l | grep nvidia-driver | awk '{print $2}')
$ sudo apt autoremove
Then, switch back to nouveau driver:
$ sudo apt install xserver-xorg-video-nouveau
when I ran this nouveau install cmd, msg was it was already installed and latest version.
Reboot your system;
login ok to desktop; yea;
Once your system has rebooted confirm loaded nouveau modules:
$ lsmod | grep nouveau
-=-=-=-=-=-=-=-